Vector mesons and electromagnetic form factor of the $\Lambda$ hyperon
High Energy Physics - Phenomenology
2018-11-21 v2 Nuclear Theory
Abstract
The measured electromagnetic form factors of hyperon in the time-like region are significantly deviated from pQCD prediction. We attribute the non-vanishing cross section near threshold to be the contribution of below-threshold (2170) state, supporting its exotic structure. Above the threshold, we find significant role of a wide vector meson with the mass of around 2.34 GeV, which would be the same state present in annihilation reactions. As a result, we give a satisfactory description of the behavior of existing data without modifying pQCD expectation.
Keywords
Cite
@article{arxiv.1808.06382,
title = {Vector mesons and electromagnetic form factor of the $\Lambda$ hyperon},
author = {Xu Cao and Jian-Ping Dai and Ya-Ping Xie},
journal= {arXiv preprint arXiv:1808.06382},
year = {2018}
}
Comments
10 pages, 1 figure, published version